equerry vs stablehand

equerry

noun
  • An officer responsible for the care and supervision of the horses of a person of rank. 

  • A personal attendant to a head of state, a member of a royal family, or a national representative. 

stablehand

noun
  • A person who works in a stable. 

How often have the words equerry and stablehand occurred in a corpus of books? (source: Google Ngram Viewer )